摘要:
在南安市花生主产区土壤养分条件下,研究氮磷钾对花生的增产效应以及推荐施肥指标,结果表明:氮磷钾增产效果为NPK,施肥效益为NKP,氮磷钾产投比分别为6.2、3.8和4.0。土壤速效养分含量与相应肥料利用率呈现负相关。土壤碱解氮、有效磷和速效钾低肥力等级临界指标含量分别为65mgkg-1、14.8 mgkg-1、36 mgkg-1;土壤碱解氮、有效磷和速效钾的高肥力等级临界指标分别为120 mgkg-1、52.6 mgkg-1、133 mgkg-1。氮磷钾推荐施肥量随土壤碱解氮、有效磷、速效钾含量的提高而减少,花生平均最高产量施N量为96.3±17.5 kghm-2,N:P2O5:K2O为1:0.53:1.29,经济施N量85.9±19.6 kghm-2,N:P2O5:K2O为1:0.51:1.25。
关键词:
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花生
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氮磷钾
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产量
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养分丰缺指标
Abstract:
NPK fertilization is important in order to increase the crop yield and income for peanut farmers in Nanan with its existing soil conditions.Effect of fertilizer application on yield were found to be N PK,and the fertilization benefit NKP.The output/input ratio of N,P2O5 and K2O were 6.2,3.8 and 4.0,respectively.There was a negative correlation between the available NPK in soil and the nutrient utilization.The critical indices of low effective phosphorus content of critical index on alkali-hydrolyzable nitrogen,available P and K in soil were 65mgkg-1,14.8 mgkg-1 and 36 mgkg-1,respectively,and those of high were 120 mgkg-1,52.6 mgkg-1 and 133 mgkg-1,respectively.The recommended NPK application rate would be reduced with high available nutrients in soil.Maximum application rate of N for peanut was 96.3 17.5 kghm-2 and the ratio of N:P2O5 :K2O was 1:0.53:1.29.The economical application rate of N was 85.9 19.6 kghm-2 at the N:P2O5:K2O ratio of 1:0.51:1.25 for the peanut farming in Nanan region.
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